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https://issues.apache.org/jira/browse/AMBARI-23838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479375#comment-16479375
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Hudson commented on AMBARI-23838:
---------------------------------

SUCCESS: Integrated in Jenkins build Ambari-trunk-Commit #9278 (See 
[https://builds.apache.org/job/Ambari-trunk-Commit/9278/])
AMBARI-23838. Ambari Server NPE due to Agent failure during registration 
(6454655+adoroszlai: 
[https://gitbox.apache.org/repos/asf?p=ambari.git&a=commit&h=d9bfcac2c53fc44ffb9a45c5ea29c592153ad069])
* (edit) 
ambari-server/src/main/java/org/apache/ambari/server/state/host/HostImpl.java


> Amabri server gets NPE due to ambari agent failure while registration
> ---------------------------------------------------------------------
>
>                 Key: AMBARI-23838
>                 URL: https://issues.apache.org/jira/browse/AMBARI-23838
>             Project: Ambari
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Yesha Vora
>            Assignee: Krisztian Kasa
>            Priority: Critical
>              Labels: pull-request-available
>          Time Spent: 2h 40m
>  Remaining Estimate: 0h
>
> One of the ambari agent logs fails to handle registration with below stack 
> trace
> {code:java}
> INFO 2018-05-14 20:38:02,377 HeartbeatThread.py:128 - Registration response 
> received
> ERROR 2018-05-14 20:38:02,378 HeartbeatThread.py:104 - Exception in 
> HeartbeatThread. Re-running the registration
> Traceback (most recent call last):
>   File "/usr/lib/ambari-agent/lib/ambari_agent/HeartbeatThread.py", line 91, 
> in run
>     self.register()
>   File "/usr/lib/ambari-agent/lib/ambari_agent/HeartbeatThread.py", line 131, 
> in register
>     self.handle_registration_response(response)
>   File "/usr/lib/ambari-agent/lib/ambari_agent/HeartbeatThread.py", line 189, 
> in handle_registration_response
>     raise Exception(error_message)
> Exception: Registration failed
> INFO 2018-05-14 20:38:02,379 transport.py:358 - Receiver loop ended{code}
> Due to this failure, ambari server gets NPE.
> {code}
> 2018-05-14 20:38:02,222  INFO [agent-register-processor-4] 
> HeartBeatHandler:312 - agentOsType = centos7
> 2018-05-14 20:38:02,296  INFO [agent-register-processor-4] HostImpl:345 - 
> Received host registration, 
> host=[hostname=xx,fqdn=xx,domain=xxx,architecture=x86_64,processorcount=2,physicalprocessorcount=2,osname=centos,osversion=7.4.1708,osfamily=redhat,memory=16777216,uptime_hours=2238,mounts=(available=233881212,mountpoint=/,used=16772348,percent=7%,size=264091716,device=/dev/mapper/docker-253:5-3014660-4abca9bb09ce35db7850a7e6c617cd995ba5093a32b05ab6ac9374c858091864,type=ext4)]
> , registrationTime=1526330282222, agentVersion=2.7.0.0
> 2018-05-14 20:38:02,308  INFO [agent-register-processor-4] 
> TopologyManager:643 - TopologyManager.onHostRegistered: Entering
> 2018-05-14 20:38:02,308  INFO [agent-register-processor-4] 
> TopologyManager:645 - TopologyManager.onHostRegistered: host = xxx is already 
> associated with the cluster or is currently being processed
> 2018-05-14 20:38:02,309  INFO [agent-register-processor-4] 
> HeartbeatController:105 -
> java.lang.NullPointerException{code}



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